lawryn -
i purchased my chapter's domain name at namesecure.com and the webhosting service at glowhost.com. i also have my own site hosted on glowhost, and know of lots of other folks that use it as well. and setting up a password protected directory is extremely easy through their service. plus, they support virtually everything you could throw their way.
good luck!
and just for fun:
www.austinareaalphaphi.org